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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40dc1c83fa45e321387f22f2850682a5b64d66a56df886a308f68b44485eb38d' 
  AND token = '2mvGm4IMB4R57kN7VElS0sf18CQRexhHmE5CxKGJFqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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