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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab08bed38ba3a96cee3f0771836898fcf1077696db20afdf5888652526017af' 
  AND token = '4w27FhRPmuf1ts8v6jSYMbDkKdcluV8LG2Sw2W85IQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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