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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ab3ece5bd9a6adc1f24e21e9f7dfb58161c86586e197c8a2d1fd57aad03ab7' 
  AND token = 'kkeXvq+u+6tbv4QNwRHw7HnIaMeqva0tIzf8wX270lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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