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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fd0987e5cc80e49ae205ddec98370c3bbbe7dc864380d451da25a1bea04e49' 
  AND token = '9+VbUg+5HZsgDikVa7a/SNsolUuYctVkRogqO3n/1cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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