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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c229ef6ad8c7951b286e75687b8ab8272064ce715f0a72d7d6dd662fa24fe61' 
  AND token = 'NgATbZA1bvtBiZCNAK+lfYxYeNz+3Xe9rsAn/Y4SKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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