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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1752e2dae588b50d826d687b6b8995dae0fb85e8c408ec86e354b85092d2558' 
  AND token = 'J5LyE5GhRj8v5ftfuaT/yY3O5vWu7EUIQywjKOL1NUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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