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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689dbb6b741f2b53a485ec9058ee6e38661930991179f193fcd9c0fd6ada9a53' 
  AND token = 'gHqw4r0T4J0Mm13MFPvnYAbUoE7fXec8aR3QsrRXQRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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