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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2b499aae1d7a7934709f6d2998188db0f164a5b7739bfad456e2f9b7f246b3' 
  AND token = 'iSCvvWCwBL2K910xqb7iQ+fqLf7hIldymhvgESmS998=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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