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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae52c47fd0cd4b105cfc71f23072c4e47210d756ff995075e5a84319e94df802' 
  AND token = '3E4TnH9QSHtiyPmcpX2yoWRWxmvoTTPky0NaXT+bCQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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