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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd0f74ede26d4da64a671f0551e7e81f5152a68148cf8cb500ba96be3c30349' 
  AND token = 'S0rMGtvoyUMNRHNIJtcK9L7wRI05h9+dAk3Qgvcl8Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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