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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bad46421ae3b5ffd93b1bb3abb7e65531e4a765f54f799b0e2f02a6f582f4b' 
  AND token = '36o743XnUjzIIQN6zCN+zZSKybKhNdFyUaw/l8Qg05s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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