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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79c81eb7db6bed0c7469fdebdd0754948d9d4990b343971830a01b9fe3a8d4f' 
  AND token = 'VrGMVbfJwBcofJS0g/APqZUVp/vTugS3NB18kW/+Bjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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