SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94c232a6323e10793588c51dff8e676d146773a2cd01c4830a7c1fa600c88d1' 
  AND token = 'x3VQYUwqvJZfdKa7ox78qruzjUfOnhTMXP+Z3dmaUDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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