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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eece7704a93fd0331f24dc764745192690e2f3efefda666aaec32ba2b7a805ee' 
  AND token = 'mJXp1oQx8muz7iQ6R4mfkS8UQIh2Ei6dBb0n7reH+Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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