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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa99defe6f2466d32def7112a60ff13e98acdfba6a63081746663fe5e96164f6' 
  AND token = '6BX65FrFKNccy7+0gtl4MnHc55hvYcJjBrO5WiW8A/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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