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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2f5b446924d84a7ee1287e60b5a9d16c39655cab4fc078f2ad75002756601c' 
  AND token = 'uiYYAv16u4vanstZ4tVHAlpp1ai4fUhCjSJvRcP100M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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