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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f19509a422085c541500304f7a5148d50f8ca8a281813ff787ab573da09c7bb' 
  AND token = 'OOZ4cKbeQNSFU3q6Uw09Kq7sIXhG0VXw5eCP45OFh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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