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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cb5af3ef7a578594e047e1bc2a3b6b49101ce5aa6fa5e75d4fc10b51417647' 
  AND token = 'jWRzo4ofKGHQnnz9lmRfLclzXwJavHYJPvu0YkblFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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