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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d29b5b47b70835a9ea6eb386b620822838bfa43f2615232f2828111254495c' 
  AND token = '0WMQxQjX540cd5fY14u0EYcD9QWEbqj4WZt+5vUVEs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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