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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04d48fe973e8ed49e41aff4c2e6b426370efba37a7ad0e5d3af970a10fd0b8' 
  AND token = 'SgVRkaBpSYj6DBk7HZEwH6pOUqbWXM8f5iO+8vsHE+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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