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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63764830691e5a01a3cbc07e878e017a1e0062b3300023902fd1b8708ff30b46' 
  AND token = 'j4ztj5uRr5U97Zk6+IKUsQxbabwJfXGwwGCct8NudM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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