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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7ebe5f0d7b5d8813bdac592726be626f35c37967870a19ea7503822c70f20d' 
  AND token = '0Ri29K7wP0RA0ufslo1q5PiA6KIIOI1iDH3PswThM1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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