SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2937f6940455645db209808cea784f7f412aefcf79f9e56db0415e1aa08de8bd' 
  AND token = 'mY/UyHRFJXyNprpNxCYzoMmL4xh0tc+9TuHvhwtlCvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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