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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f62ec7be444673cc4a087d1054c2101de36d64894308a9749a053dc409fb317' 
  AND token = 'SLAP25HESHu7YDQs8StatKjpQggucGg33yhCDfWnk44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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