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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd724853c0d171c1f8201d1fe90245e9dbbf82a37cc84881f4ccc2b9d286fba77' 
  AND token = 'pngGZ6vXWleU0AYUNEov9NHCNxaMvlNAX6B1bUA/C1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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