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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3873aaf495e760d5d2872b79945e4c1c368b1ace414b87c41fc65a6e9670e8b8' 
  AND token = '4RtN6dzSSPvwi9ikRvwODK3J7ol+TsznjHi4u2MQY0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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