Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c8665c9cd97dea82e61f90bec210e41e4bfa3212891e9470c8414199e0d005' 
  AND token = '4Qa8RqTQg0IPc9dSREYDEp0P0m1+lkHSuVtFhXsVpiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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