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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9970ece1c86ab6e2d03d9657dc82c4501391a473f7f9fb2071cb5fdfb8e00e7' 
  AND token = 'bZCLMzczUH0iUa8r0ubi7pYpOe25CZDXvPPnDRqkDC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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