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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247e27faec73a43da3d0f09a3edf1fedcf7892df05000de323621833d0c723d1' 
  AND token = 'I5lPXLgob2ekJetFewMz76KUvlrsl/YnNy2NNXuCUlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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