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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f149a55995b6df73a6cfe18a773342a28b740eb6341b3210afb9513e238fe1e' 
  AND token = 'n8zQI2tmY6owHMELhEN6PjBrsmQoDG/7ZuNhletAd8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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