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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5877f25d21b5f00077ca4da15c2f0375294ad31b51535444a1e6a50a96c0e8' 
  AND token = 'Llir6W+bAakdRVLfQRxMUtfR90VJNvxrT8O7kUUZll0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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