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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9132504ef65b0ab1a91fca05d8c2d9580d5dcc27cb0077dcfb9a8aa956d352b3' 
  AND token = 'XtYi6xAFf7EvCwLAG8JDM2bTsyqb+yz28n2j3x6ZoSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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