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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb6bef98f8bd43b04c64a307d12edd4210161fc32e3a8f3f09c2ad52ee74107' 
  AND token = 'uvseK9f4nTbw9gomEcyvbNz76a+J7om/Ap3eIbXD7GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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