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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35450dc852e68944f6b4cf5935739c022d78836728af2e9c303ae91a765a3fc4' 
  AND token = 'EjqTZSG17B9nq2k+lg8gXC4l41abwyv8xMWfFQ2Kk5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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