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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df273c27f6ec7cebbacbcda587a74e94f102d0c1a9cc53dc1b4fb07eb9a52fa8' 
  AND token = 'L6aMtou6BQEwrg/QSYrsP+SLJEJbc7FcWdBcW59Ws2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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