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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b8521191b39075cd11a53d3316cf51e24ba7e83f3e6215f354769e7d9a377f' 
  AND token = '2lOz+JUcsKNoLMAhvvnTukNj7UvDiHAibY0gskZYArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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