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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647b4b1c62eb5e9590e70d6b6ad56f510815b1787fe37736d51871198c73cef4' 
  AND token = '41mXtAL3vQA6Mn+GVa3wCEqWdn6I7nzBsqT5tkeJOkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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