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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e523fe4f4702e709b2a70727ebe8c51403e22e9f4910a7b6ffac59c08e8959c2' 
  AND token = '1w58CnqjF7eIwqdmvlKX3QUOStuA3pYQkD86txmtN20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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