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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239c421c184c0ed8033cfb40e13df0ba237619e888ad1da4893807e9acfaedfe' 
  AND token = 'd1a99IQp71Fd2rwcf3D3WkL3ywPWm4IqQnbdxLS5tn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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