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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1e95a6f072f23003aecc42ff251954c7b1fca7418411c4f48cb4ee385b65ff' 
  AND token = 'EyoCgMBdgxw06w1BKpei5da3BNiP2CdRTC9o6D2ZQ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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