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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138d601b33aafb653d0cb49a3394f3b225cb7e933153ef3403aa022f17bba218' 
  AND token = 'HUyL/uDfvMlcqvOSY5xeVlBuct7O+15g3s5nPGu7qZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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