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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae09c0f57e72b362d16efc47a5bde0e6231787defbec0ff4dcb9c6e7c6bb5ccc' 
  AND token = 'am5du0g55uvuhXvrUTTOs7tlqPxgae18nErBEERCN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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