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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e375740c41c3bfaadbd9278f7dc2eae1ff5247549e5d35c5ad439b52553d56' 
  AND token = '35MzBybEwoN+JUsW8nSf70hhUe6eB3URiBeB37en4vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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