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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2280526699921e41a7f9191d33ea6a5e39abd53788a34bdf9dd3d6b9fc1cf354' 
  AND token = 'JgK19AJXIlEYABrLgDRW9e3S7rleCzry75OUmQARgUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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