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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f2edc46a8252b4c5cb712fd1ce5900b4557851794e4f74cab30e641479ad65' 
  AND token = 'K2NlnZe2xgUX3QTYwiKq6ZcVf9kVlwsYKy/ALW/ckCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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