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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cea1567f638bb99f69ab7535cf9331b629a23f60c394d6d19b1c0c38c54dc6dc' 
  AND token = 'qvIM+bt2IzHzVoREurP1oFjEL5gAdO2ucTd7lgnxFX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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