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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786611abbec352f7c65e73a7624eeb7b046f6459f704eb10eb9c65fa8c278017' 
  AND token = 'okr9b5FwsKkFNzLLHtxl5iBi5VwxWba5Vygt5Xo0B4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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