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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35073dc77f6c867f672fb5e3df93dddec3eacccb8c335b8d61f74a2b56a00072' 
  AND token = 'ba+aC2uUYa0ODdXEpX0MhGJp6xE36G3SaL15Yrc73Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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