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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a1ef14b1ac1991a4205ec3c5f2f0bc150fa42cf5f8dbc4851a29dfccf9cab0' 
  AND token = '4o2tjwngNQjerVoDo41UoIpt30qnebMbvIedLY7e8rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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