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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '120674354f810939e8f657a8037ec24f7fbb4c38d61bd588e0fbed93f95394d3' 
  AND token = 'E/vuwfU1KNKgH0OE+JiNA+0DR7y0ebsN3bhoHx+J7PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}