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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385b0cb69652f4e22000cf02fbb4c49d8bd900a8f6de77fe8f85828c089a7079' 
  AND token = 'MkhxykJtr3bCr4njFrWgjoOXqTf7VJybFnZAUlzdyyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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