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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14334550d47edfadf4522ee27d41eb0a7fdf9bb7671b1d2fb1f28c76aad36de' 
  AND token = 'AIL3M9mvC7A7+goHjUtQ1fmysC1CUKu3Xl63FCby+Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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