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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d11caf8f6f0159e40a279919d517751cec61bf628d3436837e54400d26aa04d' 
  AND token = 'Jcp90XDCJLrMQ9CokjSq9HlCozbDrpDqxAPJxWYFdBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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