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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f773e101a059f17e556c89af6cac1148523eabc199d38daf49bc6e0ebc68e4' 
  AND token = 'nq6h0BzOg+vxn9wgsJT0rKOhmmwPhT12Xqj3Pdi9ff0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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