SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf41c794d76a6fb9b9b83350e62ce6e0b1c54c697184ad42c23af4db6f6915a' 
  AND token = 'cZvv14X7dvBB+/fOtCAKhyaej6hPaj0x9mBqnwwlhLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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