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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68db22f6124523fd1fb37a94e94e170c17ce6a91fa383c48f3b3f77037594797' 
  AND token = 'Jgxsgl7bKqZ8i0ezI/T8xujznl0ZH7ZIxqk9zrtbuCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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