SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f51739cd324fb94d026ea4b77748b908b4fe1c88145072bf8f499c2759a32' 
  AND token = 'cnlKY93jd2XBdkQwUjxwJ7ztgBqXQRvB1ziduFoPEvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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