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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317a9cbf27f7e7a5f62dd875e59f114297e677d496e3057ce423086399647dc3' 
  AND token = '3KFv/AMW5I2kRFFjk38IEoduqXLzQv14L7OO0OqnGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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