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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb36f04ae6727554ddbf3e8ede7cd3a7db21f7322bd17218cae053587dd478e' 
  AND token = 'rNRwTm8lLUuvYYsVnnlv6ya+dLPV/IoIrXYW1pufgxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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