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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed6bcd7d1589d89172d8860f7bceb1bd78abea0cd694ed6ed265bcc185dd3bf' 
  AND token = '7lOKLldEOtvKozFLTSsqLFVlzZ5La4FreZY4RjM+PHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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