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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fa4950874df840849f2a5b44ed6ca3ee1c896c0f99762a9cbbce46deeead79' 
  AND token = 'n34gWEVesBDHsrru4soRrG1qrbSj3BBc3hAq/JJStiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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