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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820b0c8828bdfc93f21e08b2d6d0a18c7c5957348e8fd12cf9b2067d7d4ab7a6' 
  AND token = 'yPZEGLffrv8CaTrxDSpLnJwbMbbJcJ5aWHqynLpRi5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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